Side note: I'm planning to schematic this so that it's under a mountain of some sort.

Seeing the level of  complexity possessed by the other builds created by other members of this wiki, I decided to try to up my game a bit. So, I increased the size of the front gate and added more detail to it. In addition to that, I added many rooms each one serving its own purpose. Here it is: 

P.S I know that this is the build request board, but I didn't know where else to go for advice.

Great job so far. Maybe use some of the obsidian dwarven brick to add some accents to the build.

Yeah, it's too monocolored. Adding some normal stone material could also work well.

Thanks for the feedback! However, I'm struggling to find ways to successfully implement stone blocks of different variety into my build. Any pointers?

Have stone be the background elements, with support pillars and decorative design as Dwaven blocks.